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(D) Let us analyze each reaction: $A.$ $2$-bromomethylcyclohexane with $NaOEt$ undergoes $E2$ elimination to form an alkene. $B.$ $2$-bromobutane with

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$B \& D$ Only

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(D) Let us analyze each reaction: $A.$ $2$-bromomethylcyclohexane with $NaOEt$ undergoes $E2$ elimination to form an alkene. $B.$ $2$-bromobutane with aqueous $KOH$ undergoes nucleophilic substitution ($SN^2$ or $SN^1$) to form butan-$2$-ol,not an alkene. $C.$ $2$-bromo-$2$-methylpropane with $NaOMe$ undergoes $E2$ elimination to form $2$-methylpropene (an alkene). $D.$ Phenol with $Na_2Cr_2O_7 / H_2SO_4$ undergoes oxidation to form $p$-benzoquinone,not an alkene. $E.$ $2$-methylpropan-$2$-ol with $Cu$ at $573 \ K$ undergoes dehydration to form $2$-methylpropene (an alkene). Thus,reactions $B$ and $D$ do not produce an alkene.

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